For the face details I used the displacement maps from texturing.xyz following Ryan Kingslein's puppet warp approach and then filling in the blanks in Mari. The source displacement map as well as albedo were originally 16k in resolution.
Here are my glorious 9 UDIMs. I wanted my work to look really pretty so I invested in quite a bit more texture space.
For the majority of the textures I have almost entirely used Substance Painter.
Lastly, I would like to thank Mr. Ryan Kingslein for all that he has taught me at his GAI bootcamp. Thank you - this entry would have looked a lot different have I not decided to learn from the best.